DELRAY BEACH -- A man who police...

DELRAY BEACH -- A man who police said went on a 22-hour cocaine-inspired robbery spree through south Palm Beach County was arrested on Friday.

Michael Andrew Powell, 28, of Delray Beach, was charged with four counts of armed robbery and two counts of aggravated assault. He was being held in Palm Beach County Jail on $40,000 bond, jail officials said.

"He admitted to us that he is addicted to crack cocaine," police spokesman Sgt. Ross Licata said. "He said he needed the money to buy more rocks."

Powell told investigators he was using several hundred dollars worth of the small white rocks each day. A typical cocaine rock sells for $10 or $20.

Police think Powell was under the influence of the powerful cocaine derivative when he committed the armed robberies.

"We consider him very dangerous," Licata said. "When someone is using that amount of drugs, you just don't know what they are capable of."

Powell is accused of robbing four businesses in Delray Beach, two in Boca Raton and several others west of those cities. The crimes occurred between 9 a.m. on Tuesday and 7 a.m. on Wednesday, police reports show.

The first robbery took place at a 7-Eleven store on West Camino Real in Boca Raton. Powell, armed with a tire iron, demanded money from a clerk, according to police reports.

The clerk panicked and ran out of the store, flagging down a passing motorist. Powell ran from the store without taking any money, police said.